Grinding-mill.



PATENTED AUG. 13, 1907- No. 863,066. PATENTED AUG. l3, 1907. L.vHOLLAND-LETZ.

GRINDING MILL. APPLICATION FILBDY mun 16.1908- mum's-anam- 2.

THE NORRIS PETERS no. WASHINGYON. n. c,

UNITED STATES LOUIS HOLLAND-LETZ,

OF CHICAGO, ILLINOIS.

' GRINDING-MILL.

Specification of Letters Patent.

Patented Aug. 13, 1907.

Application filed June 15, 1906. Serial No. 821,793.

To all whom it may concern:

Be it known that I, LOUIS HOLLAND-LETZ, a citizen of the United States,and a resident of Chicago, in the 1 county of Cook and State ofIllinois, have invented certain new and useful Improvements in Grinding-Mills, of which the following isa specification.

My invention is concerned with a novel construction of mills designedespecially for farmers use for the coarse grinding of grains for cattlefood, but which can be used for other purposes, and is designed toproduce a mill of the class described that shall be diuable and simple,capable of being cheaply constructed, and with all that can be easilyand quickly adjusted to take up wear or to grind the grain to anydesired degree of fineness.

To illustrate my invention, I annex hereto three sheets of drawings inwhich the same reference characters are used to designate identicalparts in all the figures, of which Figure 1 is a rear elevation of themachine;- Fig. 2 is a front elevation of the same; Fig. 3 is a verticalsection on the line A-A of Fig. 2; Fig. 4 is an enlarged view in sectionon the line B-B of Fig. 3; Fig. 5 is a plan view of the upper concavecasting; Fig. 6 is a similar view of the lower concave casting; Fig. 7(Sheet 1) is a perspective view from the rear of the hopper dischargecasting; Fig. 8 is a similar view from the front of the same casting;Fig. 9 is a perspective view of the concave supporting casting; Fig. 10is an enlarged sectional detail of the front supporting link; Fig. 1].is a perspective view of one of the pair of rear supporting links; Fig.12 is a plan View of the lower feed controlling plate; Fig. 13 is an endview of the frame casting with the removable bearing in place; Fig. 14is an end view of one of the cylinder heads showing the lug whichprevents movement of the cylinder between the heads; and Fig. 15 is anenlarged vertical section through the two concave castings.

I preferably provide the base piece 20, best shown in Fig. l, and mostlybroken away in Figs. 2 and 3, which is of any suitable shape to supportthe mill proper and which is preferably secured in position by the crabs21 which have the points 22 projecting down into the floor and theshoulders 23 adapted to take over the'flange 24 at the base of thecasting and to be secured by the screws 25, so that if it is desired tomove the mill backward or forward all that is necessary is to loosen thescrews 25, and when the mill has been adjusted, it can be secured inplace by merely tightening the screws. On the top 26 of this base ismounted the frame casting 2'7, which is conveniently secured by thebolts 28 passing through the horizontal bottom flanges 29, as best shownin Fig. 4. This casting consists of the side pieces or plates 30, one ofthem' having the bearing sleeve 31 integrally secured thereto, while theother one has the bearing 32 removably secured thereto by means of the Iscrew bolts 33. The end plates are connected at the i bottom by the webs34 and 35, and at the rear by the webs 36, and at the front by the web37, which is generally of a V-shape, except that the lower side isprovided with the downwardly projecting flange 38. The Webs 36 and 37and the end pieces have the horizontal flange 39 extending entirelyaround the top of the casting and upon which the bottom edges of thewooden hopper 40 are placed and secured by the bolts and nuts 41, asclearly shown in Figs. 3 and 4.

Journaled in the bearings 31 and 32 which is provided on one end withthe on the other end with the belt pulley 44, by which it is driven. Thegrinding cylinder is, of course, secured upon this shaft, and is made upof the cylindrical shell 45, which is preferably a chilled castinghaving the toothed ribs 46 extending longitudinally thereof, and held inplace between the two cylinder heads 47 and 48. The head 48 is rigidlysecured upon the shaft 42 by the pins 49 passed through the hub of thehead and the shaft, while the head 47 is loose on the shaft except as itis secured by means of the rods 50, which extend through the headsinside of the cylinder and have the heads 51 at one end and the nuts 52at the other threaded end, the heads and nuts resting in recesses of thecylinder heads, as shown. By this means the cylinder is cheaply builtand is securely fastened to the shaft. To prevent any tendency of theshaft to turn independently of the cylinder, I provide in the heads oneor more recesses 53 into which project the lugs 54 formed on the ends ofthe cylinder, as clearly shown in Fig. 14. The hopper discharge casting55 through which the grain passes to the cylinder and grinding concaveis best shown in Figs. 1, 3, 7 and 8, where it will be seen to have therectangular shape with its front side 56 narrower than its rear side 57.It is secured at its rear side to the web 36 of the frame casting by thescrew bolt 58 passing through the lug 59 into said web, and it issupported at its front end by means of the lugs 60 which rest upon thepins or lugs 61 secured in or projecting from the inner sides of theends of the frame casting. The bottoms of the ends 62 are curved, asshown, to fit over the grinding cylinder so as to clear the ribsthereof, and the rear side 57 has the flange 63 projecting therefrom andformed with its under surface curved on the arc of a circle struck fromthe pivotal points 64 from which the rear supporting links 65 are swung,so that the surface 66 of the concave supporting casting 67 willcooperate'therewith in whatever position the concave supporting castingmay be This concave supporting casting has the rearwardly extendingsides 68 which are slotted at 69, as shown, and terminate in theoutwardly projecting ears 70 through which are screwed the set screws71, the ends of which take against the sides of the supporting links 65which are pivoted at 64 to the inner sides of the ends is the shaft 42,fly wheel 43 and adjusted.

of the frame castings. These set screws 71 determine the front andrearward adjustment of the concave, and when the adjustment is made theyare secured in place by means of the lock nuts 72. The verticaladjustment of the rear end of the castings is secured by means of theset screw bolts 73 which are screwed through the threaded aperture 7 1in the inwardly projecting ear 75 forming the bottom of the link (35.This screw bolt 73 has its end cooperating with the bottom of the side68 of the concave supporting casting 67, and when the adjustment ismade, the bolt is secured in place by the lock nut 76. To further assistin securing this in place, I prelerably employ the screw bolt 77 whichpasses through the slot 69 in the ends 68 and is screwed into thethreaded aperture 78 suitably located in the link (55. The front end ofthe concave supporting casting 67 is supported from the web 37 by meansof the front supporting link 79, best shown in Fig. 10, where it will beseen to consist of a rod threaded at its-upper end and having a hook atits lower end passing through the aperture 80 in the ear 81 formed atthe front and under side 01 the casting (57. A handle 82 is provided forvarying the effective length of this link and consequently adjusting thefront edge 01' the concave casting, and as shown, this handle has thethreaded portion at its lower end, and to prevent the nut being loosenedby the vibrations of the mill, I preferably cut away a portion of thethread, leaving the aperture 83 therein, and in this aperture I placethe sectional nut 84 which has its side cooperating with the link 7 9threaded, and is held in place by means of the leaf spring 85 restingagainst it at its lower end, while its upper end is secured in thehandle, as shown. To hold the concave yieldingly, I mount upon the link79 the collar 86 which rests against the bottom of the flange 38, whichhas a recess 87 cut therein to permit the link to be swung out, andbetween the collar 86 and the pin SSnear the bottom of the link Iinterpose the hclica-lly coiled expanding spring 89 which operates inthe manner readily understood to hold the parts yieldingly in theirproper position. A

The grinding concave surface is preferably made up of the two separatecastings 90 and 91, best shown in Figs. 5, 6 and 15, where it will beseen that the upper casting 90 is secured to the supporting casting 07by means of the screw bolt 92. Both castings have along their ends theribs 93 which extend upward a portion of the height of the teeth abovethebody of the casting and serve to prevent the ground feed from runningover the edges of the concaves so that it will necessarily be discharged at the forward end of the lower concave 91. The concave casting91 has its front and rear edges formed at an acute angle, as shown, andthe rear edge its under the obtuse angle formed by the front edge of thecasting 90, and its front edge is secured by the acute angles formed inthe overhanging lugs 94 on the forward ends of the concave supportingcasting 67. The teeth 95 of the concave casting 90 are rectangular attheir bases, and are inclined to form the sharp edges and preferablyincrease in height and frequency from the top toward the bottom of thecasting, as shown in Fig. 5. The teeth 96 of the concave casting 93 are,as will be seen from Fig. 6, of a peculiar shape, they having thehorizontal portions and the inclined portions projecting upwardly fromone end of the horizontal portions. The

l l l l l object of giving this shape to the teeth is to prevent thegrain from clogging at any point and, consequently, heating on accountof the continued friction, as the inclined portions of the teeth formcam surfaces, as it were, which result in shoving the grains sidewise intheir downward motion through the machine, and this sidewise thrustgiven to the grain prevents its clogging at any point.

To control the rate of feed of grain to the machine, I provide the feedcontrolling plates 97 and 98, both of which may be vertically adjustableby means of the bolts 99 and wing nuts 100, the bolts passing throughthe elongated slots 101 and 102 formed in the front of the hopper 40.The plate 97, best shown in Fig. 12, has its lower end formed withtheteeth 103, and the end can be adjusted as close as desired to the rearwall 57 of the casting 55. The top plate 98, which may be plain orprovided with teeth, can be adjusted up and down, or to the right orleft, on the lower plate, and by thus opening or closing the aperturesbetween the teeth 103, the rate of feed of the grain to the mill can bereadily controlled.

To facilitate the discharge of the grain from the mill, I preferablyemploy the metallic chute 104, shown only in Fig. 3, which is of theproper shape to have its bottom rest upon the web 34 and have its topextend up to the bottom of the flange 38, and have its sides secured tothe inner faces of the end pieces of the frame casting.

The operation of the complete apparatus will be readily understoodwithout any explanation, and it will be seen that by means of theadjustments employed, the rate of feed and also the fineness with whichthe material shall be ground can be readily and quickly controlled bythe adjustments. When it is desired to get at the grinding concave, thelinks 79 can be released by manipulating the handle 82, and swungforward and as the links at 65 are pivoted, the entire concave can beswung away from the spring.

While I have shown and described my invention as embodied in the formwhich I at present consider best adapted to carry out its purposes, itis understood that it is capable of modifications, and that I do notdesire to be limited in the interpretation of the following claims,except as may be necessitated by the state of the prior art.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. In a grinding mill, the combination with the horizonlal cylinder and-mcans for rotating it, of the suspended concave cooperating therewith,the link connected at one end to one side of the concave and having anabutment on the other end resting on the stationary part of the machine,a collar on said link, the spring pressing the collar against thestationary part offche machine to hold the link in place, and means foradjusting the other side of the concave relative to the cylinder.

2. In a grinding mill, the combination with the horizontal cylinder, andmeans for rotating it, of the suspended concave cooperating therewith,the link connected at one end to one side of the concave and having anadjustable abutment on the other end resting on the stationary part ofthe machine, the collar on said link, the spring pressing the collaragainst the stationary part of the machine to hold the link in place,and means .for

adjusting the position of the other side of the concave 13 cooperatingtherewith, the pivoted links supporting concave at its front and rear.means for adjusting position of the concave on the rear links, and meansfor adjusting the effective length of the front link, consisting of thepivoted link rod having its upper end threaded, the nut, the abutmentfor the nut to engage, and the spring to hold the nut against theabutment.

4. In a grinding mill, the combination with the horizontal cylinder andmeans for rotating it, of the concave cooperating therewith, the pivotedlinks supporting the concave at its front and rear, means for adjustingthe position of the concave on the rear links. and means for adjustingthe effective length of the front link, consisting of the pivoted linkrod having its upper end threaded, the nut, the abutment for the nut toengage. and the helically coiled expanding spring surrounding the linkand cooperating with a loose collar engaging one side of the abutment.

7. In a grinding mill. the combination with the horizontal cylinder andmeans for rotating it, of the concave cooperating therewith. the pivotedlinks supporting the concave at its front and rear, means for adjustingthe position of the concave on the rear links. and means for adjustingthe effective length of the front link, consisting of the pivoted linkrod having its upper end threaded, the nut. a spring to hold the nutagainst the abutment, and a spring pressed sectional nut cooperatingwith the threaded portion of the link.

(3. In a grinding mill, the combination with the horizontal cylinder andmeans for rotating it, of the concave (-oi'i 'ierating therewith. thepivoted links supporting the concave at its front and rear. means foradjusting the position of the concave on the rear links, and means foradjusting the effective length of the front link, consisting of thepivoted link rod having its upper end threaded, the nut. the abutmentfor the nut to engage, the helically coiled expanding spring surroundingthe link. a loose collar engaging one side of the abutment and withwhich the spring cooperates. and a spring pressed sectional nut cooperating with the threaded portion of the link.

7. In a grinding mill, the combination with the frame the the

casting, of the cylinder journaled therein. the hopper dis' concavesupporting casting, the supporting links for the concave supportingcasting. said hopper discharge casting and concave supporting castinghaving the cooperating surfaces curved on an arc with the pivotal pointsof the links as a center, and means for adjusting the position of theconcave supporting casting 'on the links.

9. In a grinding mill, the combination with the frame casting, of thecylinder journaled therein. the hopper discharge casting rigidly securedto the frame casting, the concave supporting casting, the supportinglinks for the concave supporting casting, said hopper discharge castingand concave supporting casting having the cooperating surfaces curved onan arc with the pivotal points of the links as a center, means foradjusting the position of the concave supporting casting on the links,and the detachable link supporting the front of the concave supportingcasting.

10. In a grinding mill, the combination with the con cave supportingcasting having the overhanging lugs 94 at the front end. of the concavecasting 90 secured to the top of the rear of the concave supportingcasting and having the overhanging front edge and the concave casting 91secured between said overhanging front edge and the lugs 04.substantially as described.

11. In a grinding mill, the combination with the frame isting. of thehopper discharge casting having the ear of) and the lugs (it). the pins61 on the frame casting cooperating with the lugs 60, and the bolt 58passed through the ear 59 into the frame casting, substantially 1 as andfor the purpose described 12. In a grinding mill, the combination withthe base piece for the flange 24, of the crabs 21 having the projections2'. and the overhanging flanges S, and the screw arranged andcooperating. substantially as and for the purpose described.

13. In a grinding mill, the combination with the cylinder. of theconcave cooperating therewith, having the teeth of the upper poniontransverse to the direction of movement of the material through theconcave and the teeth of the lower portion in part transverse to and inpart inclined toward the direction of movement of the material throughthe concave, and means for rotating the cylinder.

In witness whereof. I have hereunto set my hand this 13th day of June.1906.

LOUIS IIOLLANDLETZ.

In the presence of witnesses- .Ionx II. McELnov, I). K. Maxcuns'rnn.

